Beta kids, Alpha kids, Terezi, Vriska, Karkat, Kanaya, Aradia, Gamzee, the Condesce, Arquiusprite, Tavrosprite, Rosesprite, Jaspersprite, Dad Crocker, the Mayor, Spades Slick, Ms Paint, the Felt, Bec Noir, Peregrine Mendicant, Jack English, and the Draconian Dignitary. I think that’s everyone.

They all died.

They were killed by Meenah with a suicide bomb.

The red tube contained the human’s universe and the blue tube contained the troll’s universe. The human’s universe was destroyed once Bec Noir sent the Red Miles into the Genesis Frog and the troll’s universe ended when Spades Slick shot Snowman. These two dying universes fueled the bomb and created the Green Sun.

Roxy buried Game Over!Rose’s body on Lowas and Jaspersprite dug her up and prototyped her.

Equius has got a temper and Nepeta is able to pacify him so he doesn’t become a danger to himself or others. 

I usually remember key phrases from the conversation that has the answer to the ask I’m answering and use the MSPA search function to find it.

He intercepted her meteor before it could reach Alternia and raised her as his own. 

Jade got Bec’s powers because she prototyped her dream self in the kernel sprite and when you ascend using your Quest Bed your dream self becomes the godtier. Dave did not merge with Davesprite because it was a doomed Dave that was prototyped, not his dream self. 

Yes, there are quest beds inside the moon of Prospit. This is a constant for every session.